<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>box-shadow加载动画</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #7dbaec;
        }
        .loader {
            position: relative;
            display: flex;
        }
        .loader span {
            width: 50px;
            height: 300px;
            margin: 0 20px;
            background: #7dbaec;
            animation: animate 1.4s linear infinite;
        }
        .loader span:nth-child(1){
            animation-delay: 0s;
        }
        .loader span:nth-child(2){
            animation-delay: 0.2s;
        }
        .loader span:nth-child(3){
            animation-delay: 0.4s;
        }
        .loader span:nth-child(4){
            animation-delay: 0.6s;
        }
        .loader span:nth-child(5){
            animation-delay: 0.8s;
        }
        .loader span:nth-child(6){
            animation-delay: 1.0s;
        }
        .loader span:nth-child(7){
            animation-delay: 1.2s;
        }
        @keyframes animate {
            0% {
                box-shadow: 0 0 0 rgba(0, 0, 0, 0.5);
                opacity: 0;
                transform: translateX(-50px) scale(1);
            }
            50% {
                box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
                opacity: 1;
                transform: translateX(0) scale(1.2);
            }
            100% {
                box-shadow: 0 0 0 rgba(0, 0, 0, 0.5);
                opacity: 0;
                transform: translateX(50px) scale(1);
            }
        }
    </style>
</head>
<body>
    <div class="loader">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>
</html>